There are more LGB people visibly around because we have got past the earlier prejudice and after decades of campaigning and running support services, it's easier for, especially, young people to accept that they may desire people of the same sex. This has got lumped in with the T, though often T is not to do with desire but with the common factor of sex roles, of what's allowed to women and men. Sadly questioning gender has not included what feminists in particular have tried picking apart since the year dot, which is that gender roles are constructed, there's very little that's 'natural' about masculine or feminine behaviours. The prevalence of people identifying as T is like a backlash against that earlier feminist questioning of gender roles, and in fact seems to accept them as real. Sex - male and female (and rarely, intersex) - is real. Gender is not.
It does make you wonder whether the keen-ness to encourage people to transition may have more to do with anti-gay prejudice than with a deep identity disorder. Especially in the USA, there's a lot of parents who seem more prepared to put their sons (in particular) onto the trans conveyor belt, even at the age of five, that to accept that their tiny child is not performing the traditional male roles and may even turn out to be gay. Goddess help us.